Influence De La Mise a l'HERBE Des Vaches Laitières Sur Les Indices De La Matière Grasse Du Beurre Et Sur Les Teneurs en Différents Acides Gras Poly-Insaturés

Kuzdzal-Savoie, S.; Kuzdzal, W.

doi:10.1051/rnd/19611047

Cited by 7 publications

(8 citation statements)

References 2 publications

(3 reference statements)

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“…() reported that CLA increase took 23 days to reach the maximum after turning cows out to pasture, in the present study contents were twofold greater (0.35 vs. 0.77 g/100 g) 4 days after turning out G0 cows to pasture. Our data are consistent with the report of Kuzdal‐Savoie and Kuzdal () that showed a sharply increase of CLA content reaching a maximum effect 5 days after the switch. Moreover, while these studies used a switch‐over design between contrasting diets (no grazing vs. 100% grazing), in our study, the increase in CLA content was the result of the switch from no grazing to 6 hr of grazing (20% of daily DMI of pasture; Fajardo et al., ).…”

Section: Discussionsupporting

confidence: 93%

Milk fatty acid profile from cows fed with mixed rations and different access time to pastureland during early lactation

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Olazábal

et al. 2017

Animal Physiology Nutrition

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Milk fatty acid (FA) profiles were determined in Holstein cows (n = 27) fed total mixed rations (TMR) ad libitum (G0) or diet composed by TMR (50% dry matter [DM] offered) plus grazing of pasture with 6 hr of access time to paddock in one session (G1) or 9 hr in two sessions (G2) at 45 days in milk (DIM). Moreover, milk FA was determined at 65 DIM when G0 cows turned out to G1 diet without adaptation period (Post-G0), G1 remained as controls. Milk FA was quantified using gas chromatography and mass spectrometry. Preformed FA at 45 DIM was greater (+27%) for G2 than G0 cows (p < .05). Stearic acid (C18:0) was 30% greater for G2 cows (p < .05). De novo FA was lowest for G2 cows (p < .05). Conjugated linoleic acid (CLA) did not differ (p < .12), while vaccenic acid (C18:1trans) was twofold greater for grazing treatments (p < .01). Linolenic acid [C18:3(n-3)] was greatest for G2 and lowest for G0 cows (p < .01). Omega 6 FA was greater for G0 than grazing cows, mainly due to linoleic acid [18:2cis(n-6); p < .05]. These results determined that n-6/n-3 ratio was almost threefold greater for G0 than grazing cows (p < .001). When diet of G0 cows changed to include pasture (Post-G0), preformed FA increased (p < .05), explained mainly by the increase (p < .05) of stearic (C18:0) and C18:1trans, while de novo FA tended to decrease (p < .1). Moreover, the amount of CLA and C18:3(n-3) tended to increase (p < .1) in Post-G0 cows. Offering 50% of dietary DM from pasture modified milk FA profile in early lactation potentially beneficial for human health. When TMR-fed cows were turned out to 50% pasture, milk FA profile reflected dietary change without need of an adaptation period.

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Section: Discussionsupporting

confidence: 93%

Milk fatty acid profile from cows fed with mixed rations and different access time to pastureland during early lactation

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Carriquiry

Olazábal

et al. 2017

Animal Physiology Nutrition

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“…Initially it was shown that the abrupt change from indoor feeding (grass silage, hay, and beets) to grazing cows on pasture increased conjugated dienes sharply until a maximal effect was reached after 5 days (Kuzdal-Savoie and Kuzdal, 1961). Agenäs et al (2002), however, showed an increase in both CLA and trans-C 18:1 (isomers not identified) contents from day 1 to 8 to 29 when low or high fat index cows were turned out to pasture and supplemented with hay and concentrates.…”

Section: Fatty Acid Compositionmentioning

confidence: 96%

“…Such changes in FA composition and the presence of conjugated dienes in milk fat have been noticed several decades ago (Booth et al, 1935). Total conjugated dienes in milk fat increased more than 3-fold when cows on a winter diet were turned out to pasture in summer (Kuzdal-Savoie and Kuzdal, 1961;Riel, 1963). A change in FA composition of milk also occurs when cows are withdrawn from pasture at the end of the grazing season owing once again to the changes in the rumen biohydrogenation of FA.…”

Section: Introductionmentioning

confidence: 91%

Changes in fatty acid composition of milk from lactating dairy cows during transition to and from pasture

2008

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“…2). CLA concentration in the milk of dairy cows switching from winter diet to young, natural meadow grass increases sharply [26,69]. Nevertheless, the milk CLA proportions measured in cows at pasture are variable (0.5 to 1.7%) (Tab.…”

Section: Dietary Variation Factorsmentioning

confidence: 99%

Dietary lipids and forages interactions on cow and goat milk fatty acid composition and sensory properties

2004

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-This review summarises the known effects of dietary factors on bovine and caprine milk fatty acid composition, as well as the regulation of cow and goat mammary lipid secretion. Special attention is given to fatty acids that could play a role for human health, such as saturated fatty acids, oleic acid, n-6-or n-3-C18 to C22 polyunsaturated fatty acids, trans isomers of C18:1 and C18:2, and isomers of conjugated linoleic acid (CLA). The main dietary factors taken into account are the nature of forages, including pasture, the forage:concentrate ratio and diet starch content, and the supplementation of dairy rations with crude or processed vegetable oils or oilseeds, and vitamin E. A particular emphasis is given to studies on interactions between these dietary factors, which show that there is a considerable plasticity of ruminant milk fatty acid composition. Despite the existence of several studies on the effects of dietary factors on the sensorial quality of milk and dairy products, there is a need to evaluate more deeply how the different feeding strategies could change the nutritional, sensorial and technological aspects of milk fat quality. dairy cow / dairy goat / forages / oilseeds / milk / fatty acids / human health

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Influence De La Mise a l'HERBE Des Vaches Laitières Sur Les Indices De La Matière Grasse Du Beurre Et Sur Les Teneurs en Différents Acides Gras Poly-Insaturés

Cited by 7 publications

References 2 publications

Milk fatty acid profile from cows fed with mixed rations and different access time to pastureland during early lactation

Milk fatty acid profile from cows fed with mixed rations and different access time to pastureland during early lactation

Changes in fatty acid composition of milk from lactating dairy cows during transition to and from pasture

Dietary lipids and forages interactions on cow and goat milk fatty acid composition and sensory properties

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